John Duffy - Bottom Up Approach

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Case background: 

    • 24 sexual assaults over a 4 year period, lone women at railway stations throughout the southeast of England and London.

How was the profile generated:

    • David Canter used the bottom up approach to generate a profile
    • The perpetrator was sexually experienced due to the variety of sexual practices used in the rapes
    • The perpetrator had vast knowledge of the railway systems
    • The perpetrator was aware of police procedures - combed


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